DV by sister in law.

I'm a student and i m studying in 12th class and living in delhi.My big brother got married in 2009 with her bacause of her good behaviour,nice talks,my parents also wants that my brother will happy in their marriage life so they took my brother marriage with that girl. After couple of days my sister in law's behaviour gots changed and she started torturing,abusing and fighting with my parents,my brother and my sister.I have 3 brothers(including me)and a big sister.On that particular time,we taught that she is mentally disturbed and send her to his mother's house.when she return there is no change in his behaviour,after that my sister in laws started day to day torturing,abusing and fighting with my parents with flith language,after seeing all this my brother took her to rented house and but it was not the solution.she always comes frequently to our house and abuse with flith language knowing this that my father legally evict my brother and his wife from all property by her mistreating and flith behaviour.She has gone to women cell many times for no reason.She goes to police station and charge a rape case on my brother not his husband in 2016,He got bailed because that was false alligation.my parents got aged and they are helpless,she want to grab my father's property and when i go to police station for her behaviour,the officer says me ;it's your matter..my mother is 54 and she has thyroid,when she came to our home,she got tensed and we have to took her to hospital many times.My brother and my sister is also got married and i live with my old parents,My 2nd brother also live apart,my parents afraiding that my sister in law again will do a false rape case against me because i eventually go to police station for justice.I m also afraiding that if she do that it will impact on my carreer.In Dec. 2020 my sister husband dead in a road accident.and she is living with us from 6 months as their is also lockdown and emotional problem,Now she tortures to my sister and abusing her also as she was living with us. She abuses me,my parents for no reason.I think she is jealous of my sister as she has a lot of husband'property.In this lockdown she started to make call on my 2nd brother and abusing him also for no reason.She always starts fight with her husband because he scolding her.She has recently said that I will charge a FIR against me for prostitution,if i stop her for doing this.I am feeling mentally disturbed and i cannot focus on my study.I have shooted a video clip of her in which she is abusing everyone, physically torturing to my mother and my widow sister,recently she came to our house and harm my parents and break our tv,fridge,almira,kitchen utilities,etc. Her parents support her and her parents also abuse us. I don't know what legal action I can take against her to stop all this. I went to police station many times but officer refuse to take our complaint.I got helpless, please tell me what legal action I can take to stop her doing all this.